24 Volt Thermostat Wiring; Single-Stage Heating Thermostat Application; Fossil Fuel Applications; Twinning - Maytag Amana MEC96 Series Installation Instructions Manual

24 Volt Thermostat Wiring

IMPORTANT NOTE
W
IRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER
,
OPERATION FILTER REMOVAL OR ROUTINE MAINTENANCE
Low voltage connections can be made through either the right
or left side panel. Thermostat wiring entrance holes are located
in the blower compartment. The following figure shows con-
nections for a "heat/cool system".
This furnace is equipped with a 40 VA transformer to facilitate
use with most cooling equipment. Consult the wiring diagram,
located on the blower compartment door, for further details
of 115 Volt and 24 Volt wiring.
Y C
Remote Condensing Unit
(Single-Stage Cooling)
Thermostat - Single -Stage Heating with Single-Stage Cooling
NOTE: To apply a single-stage Heating Thermostat, the thermostat
selector switch on the Integrated Control Module must be set on
single-stage.
Y C
Remote Condensing Unit
(Single-Stage Cooling)
Thermostat - Two-Stage Heating with Single-Stage Cooling
Y2
Y
Y2
Remote Condensing Unit
(Two-Stage Cooling)
Thermostat - Two-Stage Heating with Two-Stage Cooling
Thermostat Wiring Diagrams
.
R
Furnace
R Integrated
Control
Module
Figure 30
R
Furnace
Integrated
R
Control
Module
Figure 31
W1 W2
Furnace
W1 W2
Integrated
Control
Module
Figure 32

Single-Stage Heating Thermostat Application

A single-stage thermostat with only one heating stage
may be used to control this furnace. The application of a
single-stage thermostat offers a timed transition from low
to high fire. The furnace will run on low stage for a fixed
period of time before stepping up to high stage to satisfy
the thermostat's call for heat. The delay period prior to
stepping up can be set at either a fixed 10 or 20 minute
time delay or a load based variable time between 1 and 12
minutes (AUTO mode). If the AUTO mode is selected, the
control averages the cycle times of the previous three cycles
and uses the average to determine the time to transition
from low stage to high stage.
PCBBF139 CONTROL BOARD
SWITCH
PURPOSE
GROUP
1 STG STAT 10 min delay
Thermostat
S3
Setup
1 STG STAT 20 min delay
Heating
Fan Off S3
Delay
* Factory Setting

Fossil Fuel Applications

This furnace can be used in conjunction with a heat pump in
a fossil fuel application. A fossil fuel application refers to a
combined gas furnace and heat pump installation which uses an
outdoor temperature sensor to determine the most cost efficient
means of heating (heat pump or gas furnace).
A heat pump thermostat with three stages of heat is required
to properly use a two-stage furnace in conjunction with a
heat pump. Refer to the fossil fuel kit installation instruc-
tions for additional thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit
installation instructions. All furnace connections must be
made to the furnace two-stage integrated control module
and the "FURNACE" terminal strip on the fossil fuel control
board.

Twinning

Using the "TWIN" terminals and proper wiring enables two
*MEC96 furnaces of the same model and size to be twinned.
Twinning allows simultaneous operation of two furnaces
and forces the indoor blower motors of each furnace to
operate synchronously into a common duct system. Using
the twinning function will require only field installed wiring
with no external kits or parts.
· The staging DIP switches and speed tap DIP switches
must be set the same on both furnaces.
27
DIP SWITCH
FUNCTION
1 2
2 STAGE STAT OFF OFF
ON OFF
ON ON
AUTO OFF* ON*
90
120
150
180
3 4
OFF OFF
OFF ON
ON* OFF*
ON ON